Shooter kills several people, including police officer, in grocery store gun massacre

The Rachel Maddow Show - A podcast by Rachel Maddow, MSNBC

Tonight's guests are Gadi Schwartz, NBC News correspondent, Marc Sallinger, KUSA-TV reporter, Jim Cavanaugh, MSNBC law enforcement analyst, and Anna Haynes, University of Colorado student who witnessed the beginning of the Boulder, Colorado gun massacre.